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to deliver or expose to an enemy by treachery or disloyalty:
Benedict Arnold betrayed his country.
to be unfaithful in guarding, maintaining, or fulfilling:
to betray a trust.
to disappoint the hopes or expectations of; be disloyal to:
to betray one’s friends.
to reveal or disclose in violation of confidence:
to betray a secret.
to reveal unconsciously (something one would preferably conceal):
Her nervousness betrays her insecurity.
to show or exhibit; reveal; disclose:
an unfeeling remark that betrays his lack of concern.
to deceive, misguide, or corrupt:
a young lawyer betrayed by political ambitions into irreparable folly.
to seduce and desert.
Historical Examples

Doom Castle Neil Munro
Poor Folk Fyodor Dostoyevsky
The Secret of the Storm Country Grace Miller White
Much Darker Days Andrew Lang (AKA A. Huge Longway)
The Kath Sarit Sgara Somadeva Bhatta
The Masked Bridal Mrs. Georgie Sheldon
The World’s Greatest Books, Vol. I Various
The Long Roll Mary Johnston
The Quiver, 2/1900 Various
My Bondage and My Freedom Frederick Douglass

verb (transitive)
to aid an enemy of (one’s nation, friend, etc); be a traitor to: to betray one’s country
to hand over or expose (one’s nation, friend, etc) treacherously to an enemy
to disclose (a secret, confidence, etc) treacherously
to break (a promise) or be disloyal to (a person’s trust)
to disappoint the expectations of; fail: his tired legs betrayed him
to show signs of; indicate: if one taps china, the sound betrays any faults
to reveal unintentionally: his grin betrayed his satisfaction
betray oneself, to reveal one’s true character, intentions, etc
to lead astray; deceive
(euphemistic) to seduce and then forsake (a woman)


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